CVE-2024-26932
📋 TL;DR
This CVE describes a double-free memory corruption vulnerability in the Linux kernel's USB Type-C Power Delivery (PD) subsystem. The flaw occurs when unregistering PD capabilities, allowing attackers with local access to potentially crash the system or execute arbitrary code. It affects Linux systems with USB Type-C PD support enabled.
💻 Affected Systems
- Linux kernel
📦 What is this software?
Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level code execution, potentially leading to complete system compromise.
Likely Case
Kernel panic or system crash causing denial of service.
If Mitigated
System remains stable with no impact if patched or if USB Type-C PD is not used.
🎯 Exploit Status
Requires local access to trigger the double-free condition. Exploitation would require additional steps to achieve code execution beyond just crashing the kernel.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in kernel commits 242e425ed580b2f4dbcb86c8fc03a410a4084a69 and b63f90487bdf93a4223ce7853d14717e9d452856
Vendor Advisory: https://git.kernel.org/stable/c/242e425ed580b2f4dbcb86c8fc03a410a4084a69
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix. 2. Check with your distribution for specific kernel updates. 3. Reboot the system after kernel update.
🔧 Temporary Workarounds
Disable USB Type-C PD support
linuxRemove or disable USB Type-C Power Delivery functionality if not needed
echo 'blacklist typec' >> /etc/modprobe.d/blacklist.conf
rmmod typec
🧯 If You Can't Patch
- Restrict local access to systems to trusted users only
- Monitor for kernel panic/crash events related to USB Type-C or tcpm modules
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if tcpm/typec modules are loaded: 'lsmod | grep -E "(tcpm|typec)"'Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated beyond vulnerable version and check for presence of fix commits in kernel source📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages mentioning tcpm_port_unregister_pd
- KASAN reports of double-free in tcpm module
- System crashes during USB Type-C operations
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
event_source="kernel" AND (message CONTAINS "tcpm_port_unregister_pd" OR message CONTAINS "KASAN: double-free" AND module="tcpm")